/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT */
package com.barrybecker4.game.twoplayer.go.board;
import com.barrybecker4.game.common.Move;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPosition;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoBoardPositionList;
import com.barrybecker4.game.twoplayer.go.board.elements.position.GoStone;
import com.barrybecker4.game.twoplayer.go.board.move.GoMove;
import java.util.ArrayList;
import java.util.List;
/**
* The number of star points used for handicap stones on the board
* There may be none.
*
* Immutable
*
* @author Barry Becker
*/
class HandicapStones {
/** Initially the handicap stones have this health score */
private static final float HANDICAP_STONE_HEALTH = 0.8f;
/** the number of initial handicap stones to use. */
private int numHandicapStones_ = 0;
/** typically there are at most 9 handicap stones in an uneven game */
private GoBoardPositionList starPoints_ = null;
/**
* Constructor
* You cannot change the number of handicap stones after construction.
* @param num number of handicap stones
* @param boardSize on one side.
*/
HandicapStones(int num, int boardSize) {
initStarPoints(boardSize);
numHandicapStones_ = num;
}
/**
* @return number of handicap stones in this set.
*/
public int getNumber() {
return numHandicapStones_;
}
public List getStarPoints() {
return starPoints_;
}
/**
* specify the number of handicap stones that will actually be used this game.
* public since we might set if from the options dialog
* @return handicap stones
*/
public List<Move> getHandicapMoves()
{
assert numHandicapStones_ <= starPoints_.size();
List<Move> handicapMoves = new ArrayList<Move>(numHandicapStones_);
for ( int i = 0; i < numHandicapStones_; i++ ) {
GoBoardPosition hpos = starPoints_.get( i );
GoMove m = new GoMove(hpos.getLocation(), 0, (GoStone)hpos.getPiece());
handicapMoves.add(m);
}
return handicapMoves;
}
/**
* initialize a list of stones at the star points
*/
private void initStarPoints(int boardSize)
{
// initialize the list of handicap stones.
// The number of these that actually get placed on the board
// depends on the handicap
starPoints_ = new GoBoardPositionList();
int min = 4;
// on a really small board we put the corner star points at 3-3.
if (boardSize < 13)
min = 3;
int max = boardSize - (min-1);
int mid = (boardSize >> 1) + 1;
// add the star points
GoStone handicapStone = new GoStone(true, HANDICAP_STONE_HEALTH);
starPoints_.add( new GoBoardPosition( min, min, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( max, max, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( min, max, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( max, min, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( min, mid, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( max, mid, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( mid, min, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( mid, max, null, handicapStone.copy()) );
starPoints_.add( new GoBoardPosition( mid, mid, null, handicapStone) );
}
}